BAGHDAD, Iraq (CNN) -- The deputy police chief in the northern Iraqi town of Kirkuk escaped unharmed when a bomb exploded near his convoy Saturday in central Kirkuk, but one of his bodyguards was killed, police said.

In addition, the blast wounded two of Gen. Torhan Sa'eed's bodyguards and a civilian.

According to police, the attack took place shortly after noon.

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The U.S. military said terrorists on Friday fired three mortar rounds into the southern Baghdad district of Dora, killing one civilian and wounding eight others -- including four children under 10 years old.

"The indirect fire attack resulted in three large explosions near the Dora market," the military said.

The first explosion reportedly struck a house but no injuries were reported, while the second and third explosions "caused more damage to several houses and the casualties," the military said.

U.S. forces have searched the affected area and are trying to track down the suspects, the military said.

The attack comes a day after a security official in Iraq's Salaheddin province said that a U.S. military operation Thursday night killed 20 civilians, most of them women and children.

The U.S. military estimated Thursday that 15 civilians were killed by coalition forces in the operation targeting senior leaders of al Qaeda in Iraq. The military said the terrorist group put the victims in harm's way.

Meanwhile, two U.S. soldiers were killed and five others were wounded in a mortar attack launched "in the vicinity of Baghdad" on Wednesday, the U.S. military said Saturday. The deaths put the total number of U.S. military personnel killed in the Iraq war at 3,827.

The wounded troops were transported to a military medical facility for "emergency treatment and further evaluation," the military said, adding the incident is under investigation.

All seven soldiers were serving under the Fort Hood, Texas-based 15th Sustainment Brigade as part of the 1st Cavalry Division.

"The division and its brigades are currently deployed in support of Operation Iraqi Freedom controlling a 17,000-square mile area that includes Baghdad and the region south to the border of Saudi Arabia," according to the division's Web site.E-mail to a friend